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Message-Id: <1249477494.32113.4.camel@twins>
Date: Wed, 05 Aug 2009 15:04:54 +0200
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
To: Ingo Molnar <mingo@...e.hu>
Cc: Andrew Morton <akpm@...ux-foundation.org>, penberg@...helsinki.fi,
fweisbec@...il.com, rostedt@...dmis.org, mel@....ul.ie,
lwoodman@...hat.com, riel@...hat.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org
Subject: Re: [PATCH 4/4] tracing, page-allocator: Add a postprocessing
script for page-allocator-related ftrace events
On Tue, 2009-08-04 at 22:35 +0200, Ingo Molnar wrote:
> Did you never want to see whether firefox is leaking [any sort of]
> memory, and if yes, on what callsites? Try something like on an
> already running firefox context:
>
> perf stat -e kmem:mm_page_alloc \
> -e kmem:mm_pagevec_free \
> -e kmem:mm_page_free_direct \
> -p $(pidof firefox-bin) sleep 10
>
> .... and "perf record" for the specific callsites.
If these tracepoints were to use something like (not yet in mainline)
TP_perf_assign(
__perf_data(obj);
),
Where obj was the thing being allocated/freed, you could, when using
PERF_SAMPLE_ADDR even match up alloc/frees, combined with
PERF_SAMPLE_CALLCHAIN you could then figure out where the unmatched
entries came from.
Might be useful, dunno.
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